A DESCRIPTION OF THE PROBLEM :
When using the Graphics2D.draw function, the pixels drawn are getting changed depending on the fact whether the used paint is fully opaque (alpha = 255) or semi-transparent (alpha <255).

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the provided code source code.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The resulting image "output.png" should not contain any red pixels.
ACTUAL -
The resulting image "output.png" does contain red pixels.

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package main.app;

import javax.imageio.ImageIO;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Ellipse2D;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

public class Example {

    public static void main(String[] args) throws IOException {
        BufferedImage image = new BufferedImage(150, 50, BufferedImage.TYPE_4BYTE_ABGR);
        Graphics2D graphics = image.createGraphics();

        graphics.setPaint(Color.white);
        graphics.fillRect(0, 0, image.getWidth(), image.getHeight());

        Ellipse2D.Double circle = new Ellipse2D.Double(10, 10, 30, 30);
        Ellipse2D.Double ellipse = new Ellipse2D.Double(57, 12, 36, 26);
        RoundRectangle2D.Double roundRectangle = new RoundRectangle2D.Double(110, 10, 30, 30, 20, 20);

        graphics.setPaint(new Color(255, 0, 0 , 254));
        graphics.draw(roundRectangle);
        graphics.draw(circle);
        graphics.draw(ellipse);

        graphics.setPaint(new Color(0, 255, 0, 255));
        graphics.draw(roundRectangle);
        graphics.draw(circle);
        graphics.draw(ellipse);

        ImageIO.write(image, "png", new File("output.png"));
    }

}
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FREQUENCY : always